Piggery wastewater treatment by aerobic granular sludge: Granulation process and antibiotics and antibiotic-resistant bacteria removal and transport.
Piggery wastewater treatment by aerobic granular sludge: Granulation process and antibiotics and antibiotic-resistant bacteria removal and transport.
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DOI：
10.1016/j.biortech.2018.11.023
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发表时间：
2019-02
影响因子：
11.4
通讯作者：
Shuo Wang;Xinxin Ma;Yuying Wang;G. Du;J. Tay;Ji Li
中科院分区：
文献类型：
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作者：
Shuo Wang;Xinxin Ma;Yuying Wang;G. Du;J. Tay;Ji Li
本研究旨在研究好氧造粒工艺对抗生素的反应，探讨抗生素和耐药菌（ARB）的去除和转运情况。结果表明，在第45天，好氧颗粒污泥（AGS）在生物反应器中占主导地位，而紧密结合的细胞外聚合物（TB-EPS）中相对较高的蛋白质含量有助于好氧颗粒化并保持生物质稳定。EPS和TB-EPS中的蛋白质含量与相对疏水性呈正相关，从而提高了疏水颗粒之间的吸附能力。化学需氧量（COD）、氨氮（NH3-N）和总氮(N)去除率分别为98.0%、97.0%和92.4%。猪舍废水中检测到卡那霉素、四环素、环丙沙星、氨苄西林、红霉素5种抗生素，其浓度范围为29.4 ~ 44.1 µg/l，总抗生素去除率达88.4% ± 4.5%。总共有5.2%的抗生素从生物反应器排出，62.5%的抗生素被降解，32.3%的抗生素被好氧颗粒吸附。抗生素的存在很少对AGS的形成产生影响，好氧颗粒相对较高的微生物活性有利于抗生素的去除。ARB去除率可达89.4% ± 3.3%，但好氧颗粒中富集了大量ARB。
The aim of this work was to study the responses of aerobic granulation process to antibiotics and investigate the antibiotics and antibiotic-resistant bacteria (ARB) removal and transport. Results showed that aerobic granular sludge (AGS) was dominant in the bioreactor at day 45, and the relatively high protein content from tightly bound extracellular polymeric substances (TB-EPS) facilitated aerobic granulation and maintained biomass stabilization. The protein contents in EPS and TB-EPS were positively correlated with relative hydrophobicity, thereby improving the adsorption capacity among hydrophobic particles. The chemical oxygen demand (COD), NH3-N, and total N removal efficiencies were 98.0%, 97.0%, and 92.4%, respectively. Five antibiotics, including kanamycin, tetracycline, ciprofloxacin, ampicillin, and erythromycin, were examined in piggery wastewater, with concentrations up to the concentration range of 29.4–44.1 µg/l, and the total antibiotics removal rate reached up to 88.4% ± 4.5%. A total of 5.2% of the total antibiotics were discharged from bioreactor, and 62.5% of the total antibiotics were degraded, and 32.3% of total antibiotics were adsorbed by aerobic granules. The presence of antibiotics rarely exhibited an influence on AGS formation, and the relatively high microbial activity of aerobic granules was beneficial to antibiotics removal. The ARB removal rate increased up to 89.4% ± 3.3%, but a large amount of ARB was enriched in aerobic granules.